icon-action
<button class="icon-action" aria-label="Close">
<svg role="img" class="icon">
<!-- SVG markup or link ID goes here.. -->
</svg>
</button>
icon-action_color
<button class="icon-action icon-action_color_danger" aria-label="Close">...</button>
<button class="icon-action icon-action_color_caution" aria-label="Minimize">...</button>
<button class="icon-action icon-action_color_success" aria-label="Fullscreen">...</button>
icon-action_invert
<button class="icon-action" aria-label="Close">...</button>
<button class="icon-action icon-action_invert" aria-label="Close">...</button>
icon-action_subtle
<button class="icon-action icon-action_subtle" aria-label="Close">...</button>
<button class="icon-action icon-action_subtle icon-action_invert" aria-label="Close">...</button>